X0306 4 2015-12-16 1 0001082510 UIL HOLDINGS CORP UIL 0001254896 PLUMMER WILLIAM B 157 CHURCH STREET P. O. BOX 1564 NEW HAVEN CT 06510 1 0 0 0 Common Stock 2015-12-16 4 D 0 4933 0.00 D 0 D Restricted Stock 2015-12-16 4 D 0 1965 0.00 D 0 D Phantom Stock Units 2015-12-16 4 D 0 2915.151 0.00 D Common Stock 2915.151 0 D Disposed of pursuant to the merger of UIL Holdings Corporation (UIL) and Avangrid, Inc. (AGR) in exchange for a like number of shares of common stock of AGR plus $10.50 per share. Each share disposed of pursuant to the merger of UIL and AGR in exchange for 1.28059748557929000 shares of Restricted Stock of AGR. Phantom Stock Units represent directors' fees paid in shares of UIL Common Stock and deferred under UIL's Non-Employee Directors Common Stock and Deferred Compensation Plan (Plan). Payment of the phantom stock underlying the phantom stock unit is made at the time elected by the recipient pursuant to the terms and provisions of the Plan. Each share disposed of pursuant to the merger of UIL and AGR in exchange for cash in the amount of $51.525 per phantom stock unit. /s/ Patricia C. Cosgel, attorney-in-fact for William Plummer 2016-01-06